The B -> Xs gamma Rate and CP Asymmetry within the Aligned Two-Higgs-Doublet Model

TL;DR

This paper investigates the impact of the aligned two-Higgs-doublet model on the B -> Xs gamma decay rate and CP asymmetry, providing constraints on model parameters and exploring correlations with B decay observables.

Contribution

It offers a detailed analysis of CP asymmetry and branching ratios in the aligned two-Higgs-doublet model, extending previous phenomenological studies with new constraints.

Findings

Constraints on model parameters from CP asymmetry measurements

Compatibility with existing experimental limits

Predictions for correlations affecting B decay asymmetries

Abstract

In the two-Higgs-doublet model the alignment of the Yukawa matrices in flavour space guarantees the absence of flavour-changing neutral currents at tree level, while introducing new sources for CP violation parametrized in a very economical way. This implies potentially large influence in a number of processes, b -> s gamma being a prominent example where rather high experimental and theoretical precision meet. We analyze the CP rate asymmetry in this inclusive decay and determine the resulting constraints on the model parameters. We demonstrate the compatibility with previously obtained limits. Moreover we extend the phenomenological analysis of the branching ratio, and examine the influence of resulting correlations on the like-sign dimuon charge asymmetry in B decays.